Key To Time

If one or more tokens would be created under your control, twice that many of those tokens are created instead.
{1}{p/w}{p/w}, Sacrifice two other artifacts and/or creatures: Put an indestructible counter on Mondrak, Glory Dominus. ({p/w} can be paid with either {w} or 2 life.)
"It is for this that you were born. The sixth child of the
sixth generation of the sixth dynasty of Atrios. Born to
be the sixth and final segment of the Key to Time.
Come, Princess, prepare yourself."—The Shadow